Centrifugal pump housing

ABSTRACT

The invention relates to a longitudinally divided housing (1) of a flow machine. The lower part (3) of the housing (1) is provided with facets (10-13) in the region of the flange segment (4) and on the pump legs (8,9). The facets (10-13), which are located in planes intersecting the shaft axis and perpendicular thereto, serve as abutments upon attachment.

BACKGROUND OF THE INVENTION

The invention relates to a centrifugal pump of the type having a housingwhich is divided parallel to the shaft axis and comprises upper andlower housing parts provided with flange segments, the lower housingpart having suction and pressure nozzles and being provided with legs.

Such centrifugal pumps, which are very readily accessible for eventualrepairs and are generally equipped with double flow impellers, include alongitudinally divided pump housing with a shaft which is journalled atboth ends. Since the suction and pressure nozzles are located below theplane of the shaft, the centrifugal pump housing must not be removedfrom the pipe for inspection or repair. By lifting off the upper part ofthe housing, the rotating components become easily accessible and can beremoved without difficulty. A drawback of this design is the connectionbetween pump and motor which requires a particularly stable foundation,frame or the like, as well as precise alignment of pump and motor, toensure reliable operation with little wear.

A centrifugal pump with a housing divided parallel to the shaft axis isknown from the French Publication No. 488.377. The lower part, whichincludes the suction and pressure nozzles, is provided with a base platewhich also supports the bearings for the pump shaft. Installation of thepump at the erection site is made possible by means of the base plate,and particularly the lower side.

The Belgian Publication No. 385893 likewise shows a longitudinallydivided housing. The front sides of the lower housing part are providedwith mounting surfaces which serve to attach holders for the shaftbearings. Additional supports permit installation of the housing on aframe formed from double T-shaped carriers.

OBJECTS OF THE INVENTION

It is an object of the invention to develop an economical,longitudinally divided pump housing which can be coupled to a motor andcan provide versatility in pump installation.

SUMMARY OF THE INVENTION

The above and other objects of the invention are accomplished by theprovision of a centrifugal pump wherein facets which serve as abutmentsupon attachment are provided on the lower housing part in the region ofthe respective flange segment and at the pump legs. The facets arelocated in planes which intersect the shaft axis and are perpendicularthereto. The legs are disposed opposite one another in the direction ofthe shaft axis and are provided with a force-transmitting andtorque-transmitting connection.

In this manner, a motor can very easily be indirectly or directlysecured to a housing of this type by means of a flanged connection. Ifthose sides of the housing with the shaft bearings are designated thefront sides of the housing, then these are provided with facets in theregion of the flange segment. The legs of the pump are likewise providedwith facets. The facets serve as abutments upon attachment of additionalcomponents. Thus, by means of a flanged connection, a motor casing canbe secured to the lower part of the housing with four-point engagementin the region of the flange segment and the pump legs. Since the pumplegs which are located opposite one another in the direction of theshaft axis have a force-transmitting and torque-transmitting connection,deformation of the lower housing part with accompanying impairment ofshaft journalling is largely eliminated. The forces can be directlyconducted into a foundation, frame or the like at the other front sideof the housing. By virtue of the exclusive attachment to the lowerhousing part, the advantage of longitudinally divided pump housings isretained without change. In the event of an inspection or the like, thelower housing part with its connecting flanges can remain directly inthe pipe and the motor, which is secured to the lower housing part by aflanged connection, need not be removed. Nevertheless, it is possible toopen the housing without problem. The force-transmitting andtorque-transmitting connection of the pump legs disposed opposite oneanother in the direction of the shaft axis can be such that these areformed in pairs as a one-piece cast part. This gives rise to thepossibility of direct, linear force transmission. Such possibility doesnot require a specially equipped housing. Rather, a lower housing partprovided with facets of this type can be used for all applications,e.g., for conventional horizontal installation. A pump housing making itpossible to achieve versatility in installation is accordingly producedwith simple means.

According to another embodiment of the invention, the pump legs and/orthe suction and pressure nozzles are provided with facets which serve asan abutment upon attachment. The facets are located in planes whichintersect the shaft axis and are perpendicular thereto, and aforce-transmitting and torque-transmitting connection exists betweenpump legs disposed opposite one another in the direction of the shaftaxis. In this manner, it is possible to indirectly or directly connect amotor in the region of the suction and pressure nozzles of the lowerhousing part. By appropriate design of the flanges of the suction andpressure nozzles, mounting can be very easily accomplished.

An embodiment of the invention provides for respective facets to bedisposed opposite one another in pairs. This enables manufacture to besimplified and an ideal force and torque flux to be obtained.

A further embodiment of the invention provides for masses of materialapplied to the lower housing part in the region of the flange segment toconstitute part of the facets. For cast housings, in particular, largerfacets, and thereby a maximum as regards the loads to be absorbed, canbe achieved by simple industrial casting design. Such facets canlikewise be readily produced in welded structures. Moreover, itaccordingly becomes possible to use standardized elements, e.g., steelshapes among others, for attachment.

Still another embodiment provides for pump legs disposed opposite oneanother in the direction of the shaft axis to be connected to each otherin force-transmitting and torque-transmitting relationship by means ofinserts, adjusting elements or the like. In this manner, a rigidconnection between two pump legs can be obtained through the simpleinterposition of intermediate elements. By virtue of an additionalembodiment in which the pump legs are provided with openings for tierods, the components to be secured can be clamped to one another.Instead of the tie rods, it is also possible to provide the facets withfastening means to thereby connect the casing of a motor, for example,directly to the facets.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is an elevational view of the front side of the housing,

FIG. 2 is a plan view of the lower housing part and

FIG. 3 shows a vertical installation with a block motor secured by aflanged connection.

DESCRIPTION OF PREFERRED EMBODIMENTS

The illustration of FIG. 1 shows a centrifugal pump housing 1 whichconsists of an upper housing part 2 and and a lower housing part 3.Flange segments 4 connect the two halves of the housing. The lowerhousing part 3 has a suction nozzle 5 and a pressure nozzle 6 as well aspump legs 8,9 which are mounted thereon. The lower housing part furtherhas facets 10,11 in the region of the flange segment and facets 12,13 onthe pump legs. These facets are located in a plane which intersects theshaft axis 14 and is perpendicular thereto. The facets 10-13 can bearranged in two or more parallel planes. A motor which is notillustrated here and is to be indirectly or directly secured to thelower housing part comes to rest against these facets. Fastening means15, here threaded holes, simplify direct attachment to these facets.Openings 16 in the pump legs 8,9 allow clamping by means of through tierods. These can also be disposed next to the pump legs.

In FIG. 2, which is a plan view of the lower housing part, two planes16,17 containing the facets 10-13 are shown by dash-and-dot lines. It isreadily possible for the facets 12,13 on the pump legs 8,9 to lie in thesame planes or in other planes parallel thereto. The bearing cages whichcarry the pump shaft can be mounted on the flange surfaces 18,19 locatedin the region of the front sides of the housing. A bearing arrangementwithin the housing is possible. The facets 10,11 disposed in the regionof the flange segment 4 here constitute part of masses 22 of materialwhich, for a cast housing, can be readily cast as part of the same. Itis also possible to provide the facets 10-13 on the suction and pressurenozzles 5,6, either additionally or exclusively, to thereby createfurther possibilities for securing the motor.

FIG. 3 shows a vertically installed pump housing 1 provided with a motor20. The motor 20 is coupled to the facets 10-13 of the lower housingpart via a casing 21. The casing 21 is secured to one of the front sidesof the housing while the pump rests by way of the other front side ofthe housing on U-shaped carriers 23 which are connected with afoundation 24. A connection between the casing 21 and the carriers 23 isestablished in the region of the flange segment by fastening means 15,here screws, which extend into threaded bores of the facets 10,11. Inthe area of the pump legs 8, which are formed as a one-piece castsection with the lower housing part so that these are joined for forcetransmission from one to the other, the components are held together viatie rods 25 which clamp the casing 21, the pump legs 8 and the carriers23 to one another.

We claim:
 1. A centrifugal pump comprising a housing; and a shaft rotatable in said housing about a predetermined axis, said housing being divided parallel to said axis and including an upper part and a lower part, said parts including flange segments and said lower part further including suction and pressure nozzles and legs serving for installation, said lower part further including facets which serve as abutments upon attachment of additional components and include facets at the respective flange segment and facets at said legs, said facets being located in planes which intersect and are perpendicular to said axis and said legs being disposed opposite one another in the direction of said axis and being provided with a force-transmitting and torque-transmitting connection.
 2. The pump of claim 1, wherein said facets include facets on said legs.
 3. The pump of claim 1, wherein said facets include at least one facet on at least one of said nozzles.
 4. The pump of claim 1, wherein said facets include pairs of facets and the facets of at least one of said pairs are disposed opposite one another.
 5. The pump of claim 1, wherein the facets at the flange section of said lower part include masses of material.
 6. The pump of claim 1, wherein said legs are connected to one another by at least one insert.
 7. The pump of claim 1, wherein said legs are connected to one another by at least one adjusting element.
 8. The pump of claim 1, wherein said legs have openings for tie rods.
 9. The pump of claim 1, wherein said facets have fastening means. 